#include <stdio.h>
#include <string.h>

int main()
{
    char arr[] = "abcdef";
    char arr2[] = {'a', 'b', 'c', 'd', 'e', 'f', '\0'};
    printf("%s\n", arr);
    printf("%s\n", arr2);
    printf("%zu\n", strlen(arr));
    printf("%zu\n", strlen(arr2));
    return 0;
}